Ludlum 3-98 Alpha-Beta-Gamma Survey Meter



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Ludlum's Model 3-98 is uniquely configured to optimize measurements for 125I and any alpha, beta, or gamma contamination. The dual detector design allows the user to select the detector for the task at hand. The internally-housed GM pancake detector can be used to measure gamma. This detector's face can be exposed via a slide located along the bottom of the instrument, thus making it sensitive to alpha and beta as well. The external NaI detector, Ludlum Model 44-3, is optimized for low-energy gamma from 125I.

The ratemeter is Ludlum's venerable Model 3-series, which employs a robust, cast aluminum instrument housing with a separate battery compartment for long-lasting protection and long instrument life. The front-panel controls include a rotary switch for selecting the 4-decade range, instrument shut-off and battery test, audio on/off switch, fast/slow response switch, count reset button, and internal/external detector switch. Also included are a standard 1-meter (39 inch) cable with series "C" connector (others available), detector clip, and two "D" cell batteries.


Used. Units were power tested and power up. Audio works and needle moves freely. No further testing or calibration was performed. These units may need calibration.

NOTE: There is paint damage on the side of these units. Please see pictures.


    (1) Ludlum 3-98 Survey Meter

    (1) Ludlum 44-2 Gamma Detector

    (1) Carry Case

    (1) Instruction Manual


      30 Day warranty. We pledge to offer the best service and warranty to all of our customers!  We are extending a 30 Day warranty on this item. This is our way of saying thank you for allowing us to serve you.


      This is a genuine product from this manufacturer.